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1. Explain the difference between rotor speed and rotor frequency. For s = -0.01 and a rotor speed of 1740 rpm, what is the rotor frequency for a 60 Hz induction generator?

2. Explain why the efficiency of an induction generator can be smaller when working as an asynchronous motor under certain conditions.

3. Calculate the efficiency of a 110 V, 60 Hz induction generator connected directly to the grid with the following parameters: Rm = 36.2 Ω; losses equal to 0.8% of the rated power; s = -0.03; R₁ = 0.2 Ω; R₂ = 0.15 Ω; X₁ = 0.42 Ω; X₂ = 0.43 Ω.

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